body {
  width: 100%;
  height: 100%;
}
.app {
  width: 52px;
  height: 57px;
  position: fixed;
  right: 0;
  bottom: 0;
}
.icon_menu {
  width: 57px;
  height: 57px;
  position: absolute;
  bottom: 2px;
  right: 2px;
  z-index: 10;
  cursor: pointer;
}
.icon_menu span {
  display: none;
}
.btn {
  width: 52px;
  height: 57px;
  background: url(../image/bg1.png) no-repeat -78px -6px;
  z-index: 1;
  position: absolute;
  bottom: 0;
  right: 0;
  margin: 0 5px 2px 0;
  cursor: pointer;
  -webkit-transition: bottom 0.2s, right 0.2s;
  -moz-transition: bottom 0.2s, right 0.2s;
  -o-transition: bottom 0.2s, right 0.2s;
  -ms-transition: bottom 0.2s, right 0.2s;
  transition: bottom 0.2s, right 0.2s;
}
.btn span {
  display: block;
  width: 22px;
  height: 24px;
  font-size: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -12px;
  margin-left: -11px;
  overflow: hidden;
  background: url(../image/bg1.png) no-repeat;
}
.btn1 span {
  background-position: -176px -20px;
}
.btn1.open {
  bottom: 175px;
  right: 0;
}
.btn2 span {
  background-position: -198px -18px;
}
.btn2.open {
  bottom: 150px;
  right: 62px;
}
.btn3 span {
  background-position: -221px -18px;
}
.btn3.open {
  bottom: 105px;
  right: 112px;
}
.btn4 span {
  background-position: -243px -19px;
}
.btn4.open {
  bottom: 40px;
  right: 140px;
}
.btn5 span {
  background-position: -267px -20px;
}
.btn1.close,
.btn2.close,
.btn3.close,
.btn4.close {
  bottom: 0;
  right: 0;
}
